JP2010540089A - Connecting power head ram and power injector syringe - Google Patents

Abstract

A ram assembly (110) for a power injector (10) having an inner ram (120) that is movable relative to the outer ram (140) is disclosed. Each of the one or more ram connectors (158) includes a cam slot (164) and is slidably interconnected with an end (150) of the outer ram (140). The inner ram (120) includes a cam (128) disposed within the cam slot (164) of its corresponding ram connector (158). The relative motion between the inner ram (120) and the outer ram (140) varies with respect to the end (150) of the outer ram due to the cam effect between the cam (128) and the cam slot (164). Move the ram coupler (158). The ram connector (158) may be used to establish both a connected state or situation and a separated state or condition with the syringe plunger connector (34) of the syringe plunger (32) of the power injector syringe (28). .

Description

(Related application)
This application claims priority based on US Provisional Application No. 60 / 975,838 (filed Sep. 28, 2007, entitled “COUPLING OF POWERHEAD RAM AND POWER INJECTOR SYRINGE”).

(Technical field)
The present invention relates generally to power injectors, and more specifically to the manner in which the syringe plunger drive system and syringe plunger of the power injector are connected / disconnected.

  Various medical procedures require that one or more fluids be injected into the patient. Medical imaging procedures often involve injecting a contrast agent into the patient, possibly with saline or other fluid. Other medical procedures involve injecting one or more fluids into a patient for therapeutic purposes. Power injectors can be used for these types of applications.

  Power injectors generally include what is commonly referred to as a powerhead. One or more syringes can be attached to the powerhead in a variety of ways (eg, detachable, rear loading, front loading). Each syringe typically includes what may be characterized as a syringe plunger, piston, or the like. Each such syringe plunger is suitably interconnected to a suitable syringe driver that is incorporated into the powerhead such that operation of the syringe driver causes the associated syringe plunger to travel axially. One typical syringe driver is in the form of a threaded lead or ram that is mounted on a drive screw. The rotation of the drive screw in one direction of rotation causes the associated ram to advance in one axial direction, and the rotation of the drive screw in the opposite direction of rotation causes the associated ram to advance in the opposite axial direction.

  One or more syringes are typically attached to the powerhead for the infusion procedure and removed after the infusion procedure is complete. Therefore, there is a need to provide a method for connecting a syringe driver and a syringe plunger and then separating the syringe driver and the syringe plunger. Various designs have been proposed to provide a detachable connection between the syringe driver and the syringe plunger, including 1) an injection procedure to separate the syringe driver and the syringe plunger. With the syringe driver and syringe plunger moving in, moving the syringe away from the axis, and 2) typically in combination with at least some types of relative axes between the syringe driver and the syringe plunger Rotating the syringe relative to the syringe driver to place the component in a position for coupling or separation of the syringe driver and syringe plunger, and 3) typically the syringe driver and syringe In combination with at least some kind of relative axis between the plunger and the syringe driver that moves during the injection procedure Use a jaw that can pivot on the syringe drive or equivalent in combination with the relative movement between the syringe drive and syringe plunger in a plane perpendicular to the axis along which the syringe plunger runs or in combination with both. Connecting to a syringe plunger.

  A first aspect of the invention is embodied by a ram assembly for a power injector that is movable along a path to release fluid from the syringe upon interconnection with the ram assembly. The components of the ram assembly include a first ram section in the inner ram form, a second ram section in the outer ram form, and a ram coupling. The outer ram is movable relative to the inner ram. Further, the ram coupler is movable relative to at least one of the inner ram and the outer ram in response to movement of the outer ram relative to the inner ram. This movement of the ram connector connects or separates the ram connector and syringe plunger connector of the syringe described above, i.e. changes the connection between the ram connector and the associated syringe plunger connector.

  A second aspect of the present invention is embodied by a ram assembly for a power injector that is movable along a path to release fluid from the syringe upon interconnection with the ram assembly. The components of the present ram assembly include a first ram section in the form of an inner ram, a second ram section in the form of an outer ram that includes an end of the outer ram that defines the end of the ram assembly, and a ram coupler. Including. The outer ram is movable relative to the inner ram. Furthermore, the ram coupler is such that movement of the ram coupler relative to the outer ram couples or separates the ram coupler and the syringe plunger coupler of the above-described syringe, i.e., a syringe plunger coupler associated with the ram coupler. Are slidably interconnected with the outer ram so that the connection state between them is changed. This type of movement with respect to the ram coupler is responsive to relative rotational movement between the inner and outer rams.

  The third aspect of the present invention is embodied by a method for changing the connection between a syringe and a ram assembly of a power injector. The syringe includes a plunger, which in turn includes a syringe plunger connector that is interconnected to and movable with the syringe plunger. The ram assembly includes a first ram section, a second ram section, and a ram coupling. The first ram section rotates relative to the second ram section. The ram coupling is moved relative to at least one of the first ram section and the second ram section in response to relative rotational movement between the first ram section and the second ram section. The connection state between the syringe plunger connector and the ram connector is changed.

  There are various improvements with respect to the features described in connection with each of the aforementioned first, second and third aspects of the present invention. Further features may be incorporated into each of the above-described first, second, and third aspects of the present invention. These refinements and additional features may exist alone or in combination with each of the first, second, and third aspects. That is, unless explicitly stated to the contrary, each of the following features described in relation to the first, second, and third aspects need not be used with any other feature or combination of features: Absent.

  The ram assembly can be incorporated in any suitable manner by any suitable power injector. Such power injectors may be used for any suitable application where delivery of one or more fluids is desired, such as any suitable medical application (eg, computed tomography or CT imaging, magnetic resonance imaging or MRI, SPECT imaging, PET imaging, X-ray imaging, angiographic imaging, optical imaging, and ultrasound imaging). The power injector may be used with any component or combination of components, such as a suitable imaging system (eg, a CT scanner). For example, information (eg, scan delay information, injection start signal, injection rate) may be communicated between the power injector and one or more other components. Any suitable number of syringes can be integrated into the power injector in any suitable manner (eg, detachable, rear loading, front loading), and any suitable fluid can be integrated into a given syringe of the power injector. Any suitable fluid can be discharged from the multiple syringe powered injector configurations in any suitable manner (eg, sequentially, simultaneously), or any combination thereof. In one embodiment, the fluid released from the syringe by the operation of the power injector is directed to a conduit, where the conduit is fluidly interconnected to the syringe in any suitable manner to allow the fluid to flow as desired. Point to a location (eg, patient).

  The first ram section (eg, the inner ram), the second ram section (eg, the outer ram), and the ram coupler can move together along an axial path. Such movement of the ram assembly provides various functions and / or can accommodate various functions. In one embodiment, the ram assembly moves along an axial path to release fluid from an interconnected syringe (eg, a discharge stroke). In one embodiment, the ram assembly may move along an axial path to a position for subsequent execution of the discharge stroke. In one embodiment, the ram assembly moves along an axial path to load fluids into or to accommodate the interconnected syringes (eg, to place the syringe plunger in the retracted position). Can do. In general, any suitable direction or combination of functions may be provided by any given direction and / or manner of axial movement of the ram assembly.

  Each of the first ram section (eg, the inner ram) and the second ram section (eg, the outer ram) may have any suitable size, shape, configuration, and / or type. In one embodiment, the second ram section is disposed around at least a portion of the first ram section. In one embodiment, the first ram section of the inner ram type may be at least partially disposed within the second ram section of the outer ram type. In one embodiment, the first ram section and the second ram section are arranged concentrically.

  Relative movement between a first ram section (eg, inner ram) and a second ram section (eg, outer ram) may be enabled in one aspect (eg, relative rotational movement may be The first ram section in at least one other aspect, while allowing the outer ram to rotate and whether the inner ram rotates or not, the outer ram rotates or both) Relative motion between the ram section and the second ram section can be constrained (eg, the first ram section and the second ram section are at least substantially stationary relative to each other during axial movement of the ram assembly). Can be held in). The relative movement between the first ram section and the second ram section that actuates one or more ram couplings can have any suitable type, or any suitable aspect (eg, rotational motion) And this relative movement can be realized in any suitable manner. Only a certain relative movement is required between the first ram section and the second ram section. Thus, the second ram section may move in a constant manner to operate one or more ram couplers, while the first ram section may move in this same manner during operation of the ram coupler. It can be held in a fixed position or vice versa.

  Using at least a constant relative movement between a first ram section (e.g., inner ram) and a second ram section (e.g., outer ram), between the ram connector and the associated syringe connector. One or more ram couplers may be activated to change the coupling state. As described above, a change in the “coupled state” both establishes the connection between the ram connector and the syringe plunger connector and establishes the separation of the ram connector from its associated syringe plunger connector. Include. For example, the ram coupler may move relative to the first ram section, the second ram section, or both to change its coupling state with the associated syringe plunger coupler. Relative movement between the first ram section and the second ram section and at least one of the first ram section and the second ram section for changing its coupling state with the syringe plunger connector; The relative movement between can be of different types or can be of different modalities. In one embodiment, the first ram section and / or the second ram section is adapted to actuate an axial movement of the ram coupler relative to at least one of the first ram section and the second ram section. Rotate.

  The ram coupler can have any suitable size, shape, configuration, and / or type. Any suitable movement in one or more aspects may be utilized by the ram connector to change its connection with the associated syringe connector. In one embodiment, the ram coupler moves along an axial path relative to at least one of a first ram section (eg, an inner ram) and a second ram section (eg, an outer ram). Then, the connection state with the related syringe plunger connector is changed. In one embodiment, the ram connector moves at least generally away from the axis (e.g., along the movement of the entire ram assembly) to achieve one of the connected or disconnected states with the associated syringe plunger connector. And may move at least generally towards this same axis to achieve the other of the connected or disconnected states. In each of these cases, the ram coupler can be slidably interconnected with either the first ram section or the second ram section.

  Any suitable manner of integrating the ram coupler with the ram assembly may be utilized. In one embodiment, the ram coupler is slidably interconnected with a second ram section in the form of an outer ram. For example, the outer ram can include a slot and the ram coupler can be disposed within the slot. In one embodiment, the end of the second ram section of the outer ram type includes a slot for a ram connector, where the end of the outer ram faces the corresponding syringe when interconnected therewith. Protruding.

  The cam action can be utilized to generate a relative movement of the ram connector to change its connection with the associated syringe plunger connector. In one embodiment, one of the first ram section (eg, inner ram) and the second ram section (eg, outer ram) is characterized as a first cam member or element (eg, cam). While the ram coupler may have a second cam member or element (eg, a cam follower). Each of these cam members can have any suitable size, shape, configuration, and / or type.

  The ram assembly may use multiple ram couplers, and the multiple ram couplers may be arranged in any suitable arrangement. The entire description presented herein with respect to ram couplers may be applied to each ram coupler of multiple ram coupler configurations as desired / needed. The plurality of ram connectors can be moved together to change the connection state with the associated syringe plunger connector. Each of the plurality of ram couplers may be movable away from at least a generally common location to affect a change in coupling with an associated syringe plunger connector, at least toward a generally common location. It can be movable or both. In one embodiment, this common location is a central longitudinal reference axis that coincides with the length of the ram assembly, ie, the axis along which the ram assembly can move. In one embodiment, each of the plurality of ram couplers has a first ram section and a second ram section (eg, an inner ram and an outer ram) so as to change the coupling state with the associated syringe plunger coupler. Are movable along different axial paths for at least one of the two.

  In the first embodiment, the first ram section may be in the inner ram section, the second ram section may be in the outer ram form, and the inner ram may be at least partially disposed within the outer ram. The outer ram may include an end defining an end of the ram assembly, and the ram coupling may be slidably interconnected with the end of the outer ram. Various features may be added in connection with this first embodiment, which are described below and applied alone or in any desired combination.

  The first embodiment described above may include a rotation lock that engages the outer ram so that the inner ram rotates to move the ram coupler relative to the end of the outer ram. In this case, the outer ram can be held at least approximately in a rotationally stationary position by the rotational locking portion. The extent to which the inner ram can rotate may be limited in any suitable manner in this case. For example, the outer ram can include a slot. A stop can pass through the slot to the inner ram, and the stop can be held in a fixed position relative to the inner ram in any suitable manner (eg, the stop is inward in any suitable manner). Can be attached to the ram). During rotation of the inner ram, the stop can advance along the slot of the outer ram. Accordingly, the slot length of the outer ram can establish the range within which the inner ram can rotate.

  The first embodiment described above interconnects with the inner ram (relative to the outer ram as described above) such that the outer ram rotates to move the ram coupler relative to the end of the outer ram. A rotation lock may be included. In this case, the inner ram can be held by the rotational locking part at least in a generally rotationally stationary position.

  In the first embodiment described above, the ram coupler may be slidably interconnected to the end of the outer ram. For example, the end of the outer ram can include a slot, and the ram coupler can be slidably disposed within the slot. In any case, the inner ram may include a first cam member or element and the ram coupler may include a second cam member or element that is at least engageable with the first cam member. . Relative movement between the first cam member and the second cam member (eg, by moving the inner ram relative to the outer ram) actuates the ram coupler (eg, ram relative to the outer ram). Move the coupler). In one embodiment, the first cam member is disposed on the end of the inner ram, while the second cam member is disposed on the surface of the ram coupler that projects toward the end of the inner ram. Is done. Each of the first cam member and the second cam member may have any suitable size, shape, configuration, and / or type in accordance with the foregoing description.

  The ram connector is such that the head of the syringe plunger connector is captured during retraction of the ram assembly, during extension of the ram assembly (eg, to advance the syringe plunger of the syringe during the discharge stroke), or both It can be placed in some position. The syringe plunger connector can extend from the syringe plunger, and the ram connector can be positioned between the head and the syringe plunger, positioned in alignment with the head in the manner in which the ram assembly moves, and the syringe plunger Move. The ram connector is also positioned so that the end of the inner ram engages the head of the syringe plunger connector during extension of the ram assembly (eg, to advance the syringe plunger of the syringe during the discharge stroke). Can be placed. For example, the ram coupler may move out of alignment with the syringe plunger coupler head in a manner that moves the ram assembly to move the syringe plunger.

  The ram assembly may be incorporated by any suitable size, shape, configuration, and / or type of power injector. The power injector may include a rotatable drive screw, and the ram assembly may be interconnected with the drive screw so as to move along the drive screw upon rotation by the drive screw. The direction in which the ram assembly moves along the drive screw may depend on the direction of rotation of the drive screw. The inner ram, outer ram, or both may rotate to actuate the ram coupler. In one configuration, the corresponding syringe and outer ram are rotated by the syringe (e.g., where this rotational movement attaches the syringe to or separates the syringe from the power injector power head), then Rotate the outer ram to activate the ram coupler. In another configuration, rotation of the drive screw may rotate the inner ram to actuate the ram coupler, and the amount that the inner ram can rotate can be limited according to the foregoing description. The inner ram may rotate to actuate the ram coupler (eg, the amount that the inner ram can rotate may be limited according to the description above), and this rotation of the inner ram is responsive to the rotation of the drive screw. Can do. The threaded interconnection between the drive screw and the ram assembly may provide the force used to rotate the inner ram along the drive screw along with the rotation of the drive screw. In each of these embodiments, each of the inner ram and ram coupler may include an interacting cam member or element in accordance with the foregoing description.

FIG. 1 is a schematic diagram of one embodiment of a power injector. FIG. 2A is a perspective view of one embodiment of a mobile stand-mounted dual head power injector. 2B is an enlarged partial exploded perspective view of a power head used by the power injector of FIG. 2A. 2C is a schematic illustration of one embodiment of a syringe plunger drive assembly used by the power injector of FIG. 2A. FIG. 3A is an exploded perspective view of one embodiment of a ram assembly that utilizes a rotatable section for actuating a coupler that engages a syringe plunger coupler and that may be utilized by a power injector. FIG. 3B is a plan view of one of the ram couplers from the ram assembly of FIG. 3A showing its cam slot. FIG. 4A is an end view of the ram assembly of FIG. 3A with the ram coupler in a position to retract the syringe plunger. 4B is an end view of the ram assembly of FIG. 3A with the ram connector in position to advance the syringe plunger for fluid discharge or discharge stroke. 5 is an exploded perspective view of a variation of the ram assembly of FIG. 3A. FIG. 6A is an end view of the ram assembly of FIG. 5 with the ram connector in a position to be coupled to and advance the syringe plunger. 6B is an end view of the ram assembly of FIG. 3A with the ram coupler in position for separation from the syringe plunger. 7 is an exploded perspective view of one embodiment for providing an actuating force to move the ram coupler from the position of FIG. 6A (coupled / coupled) to the position of FIG. 6B (separated / separated). FIG. 8 is another perspective view of the face plate shown in FIG.

  FIG. 1 shows a schematic diagram of one embodiment of a power injector 10 having a powerhead 12. The syringe 28 may be installed on the power head 12 and may be considered part of the power injector 10. Depending on the injection procedure, a relatively high pressure may be generated in the syringe 28. In this regard, it is desirable to place a syringe 28 within the pressure jacket 26. The pressure jacket 26 is typically installed on the powerhead 12 and then a syringe 28 is placed on the pressure jacket 26. When the various syringes 28 are placed in and removed from the pressure jacket 26 for multiple infusion procedures, typically the same pressure jacket 26 remains installed on the powerhead 12. is there. If the power injector 10 is configured / utilized for low pressure injection, the power injector 10 may eliminate the pressure jacket 26. In any case, the fluid released from the syringe 28 is directed to a conduit 39 of any suitable size, shape, configuration, and / or type, and the conduit 39 is in any suitable manner. And fluids can be directed to any suitable location (eg, patient).

  The powerhead 12 includes a syringe plunger drive assembly 14 that interacts with the syringe 28 to release fluid from the syringe 28. The syringe plunger drive assembly 14 includes a drive source 16 (eg, any suitable size, shape, configuration, and / or type of motor, any gear, for powering a drive output 18 (eg, a rotatable drive screw). Equipment, and the like). The ram 20 can be advanced along an appropriate path (eg, axial) by the drive output 18. The ram 20 may include a connector 22 for interacting with a corresponding portion of the syringe 28 in the manner described below.

  The syringe 28 includes a plunger or piston 32 that is movably disposed within the syringe barrel 30 (eg, for axial reciprocation along an axis that coincides with the double-headed arrow B). Plunger 32 may include a connector 34. The syringe plunger connector 34 interconnects with the ram connector 22 and allows the syringe plunger drive assembly 14 to retract the syringe plunger 32 within the syringe barrel 30. Retraction of the syringe plunger 32 is utilized to accommodate loading fluid into the syringe barrel 30 for subsequent injection or discharge, or actually draws fluid into the syringe barrel 30 for subsequent injection or discharge. Or may be used for any other suitable purpose. Certain configurations may not require the syringe plunger drive assembly 14 to be able to retract the syringe plunger 32, in which case the ram connector 20 and syringe plunger connector 34 may not be required. Even when using the ram connector 22 and the syringe plunger connector 32, the ram 20 advances the syringe plunger 32 to release fluid from the syringe 28 (eg, the ram 20 simply presses the syringe plunger 34). These components may or may not be connected. Any single motion or combined motion in any suitable aspect or combination of aspects places the ram connector 22 and syringe plunger connector 34 in a connected state or situation, or the ram connector 22 and syringe plunger connection. The tool 34 can be placed in a separated state or situation, or can be used to place it in both.

  The syringe 28 can be placed on the powerhead 12 in any suitable manner. For example, the syringe 28 can be configured to be installed directly on the powerhead 12. In the illustrated embodiment, a housing 24 is suitably mounted on the power head 12 to provide an interaction between the syringe 28 and the power head 12. The housing 24 may be in the form of an adapter in which one or more configurations of syringes 28 may be installed, in which case at least one configuration of syringes 28 is a powerhead without the use of any such adapters. 12 can be installed directly. Moreover, the housing | casing 24 may be a faceplate format in which the syringe 28 of one or more structures can be installed. In this case, a face plate is required for installation of the syringe 28 on the power head 12, that is, the syringe 28 cannot be installed on the power head 12 without including the face plate. When using the pressure jacket 26, the pressure jacket 26 may be installed on the powerhead 12 in various manners described herein with respect to the syringe 28, and then the syringe 28 is installed in the pressure jacket 26.

  The housing 24 is mounted on the power head 12 when the syringe 28 is installed, and may be in a fixed position with respect to the power head 12. Another option is to movably interconnect the housing 24 and the powerhead 12 to accommodate the installation of the syringe 28. For example, the housing 24 moves in a plane that includes the double-headed arrow A to provide one or more of a connected state or condition and a disconnected state or condition between the ram connector 22 and the syringe plunger connector 34. Can do.

  One particular power injector configuration is shown in FIG. 2A and is identified by the reference numeral 40 and follows at least approximately the power injector 10 of FIG. The power injector 40 includes a power head 50 mounted on a mobile stand 48. A pair of syringes 86 a and 86 b for the power injector 40 are mounted on the power head 50. Fluid may be released from the syringes 86a, 86b during operation of the power injector 40.

  Mobile stand 48 may have any suitable size, shape, configuration, and / or type. Wheels, rollers, casters, or the like can be used to make the stand 48 mobile. The power head 50 can be held in a fixed position relative to the mobile stand 48. However, it is desirable to allow the position of the powerhead 50 to be adjustable relative to the mobile stand 48 in at least some manner. For example, when loading fluid into one or more of the syringes 86a, 86b, the mobile stand 48 has a power head 50 at one position relative to the mobile stand 48 to perform the injection procedure. It is desirable to have the power head 50 at a different position. In this regard, the powerhead 50 moves to the mobile stand 48 in any suitable manner (eg, such that the powerhead 50 pivots over at least a certain region of motion and then is held in a desired position). Can be interconnected as possible.

  It should be understood that the powerhead 50 can be supported in any suitable manner to provide fluid. For example, instead of mounting on a mobile structure, the powerhead 50 can be interconnected with a support assembly, and then the support assembly is mounted on a suitable structure (eg, ceiling, wall, floor). Any support assembly for powerhead 50 may be positionable at least in some respects (eg, one or more support sections that may be repositioned relative to one or more other support sections). Or by being held in a fixed position. Further, the powerhead 50 can be integral with any such support assembly such that it is held in a fixed position or adjustable with respect to the support assembly.

  The powerhead 50 includes a graphical user interface or GUI 52. The GUI 52 controls one or more aspects of the operation of the power injector 40, inputs / edits one or more parameters related to the operation of the power injector 40, and appropriate information (eg, power injector 40 It may be configured to provide one or any combination of functions of display of information related to operation. The power injector 40 may also include a console 42 and a power pack 46, each of which may be placed on a table or mounted in a laboratory electronics rack or any other suitable location. May communicate with the powerhead 50 in any suitable manner, which may be or both (eg, via one or more cables). The power pack 46 allows connection of the power injector 40 to a remote unit, such as a power supply for the injector 40, an interface circuit for providing communication between the console 42 and the powerhead 50, a remote console, etc. A circuit, remote hand or foot control switch, or other original equipment manufacturer (OEM) remote control connection (eg, allowing operation of the injector 20 to be synchronized with x-ray exposure of the imaging system), and It may include one or more of any other suitable components and any suitable combination. The console 42 may include a touch screen display 44 that allows one or more aspects of the operation of the power injector 40 to be remotely controlled by the operator, operation of the power injector 40. Allowing the operator to enter / edit one or more relevant parameters, enabling the operator to identify and store a program for automatic operation of the power injector 40 (later upon startup by the operator, Provide one or more of the functions of displaying any suitable information associated with the power injector 40 and including any aspect of its operation) Can do.

  Various details regarding the integration of the syringes 86a, 86b into the powerhead 50 are shown in FIG. 2B. Each of the syringes 86a, 86b includes the same general components. Syringe 86a includes a plunger or piston 90a that is movably disposed within syringe barrel 88a. By movement of the plunger 90a along the axis 100a (FIG. 2A) through the operation of the power head 50, fluid is discharged from the syringe barrel 88a through the nozzle 89a of the syringe 86a. A suitable conduit (not shown) typically fluidly interconnects the nozzle 89a in any suitable manner and directs the fluid to a desired location (eg, a patient). Similarly, the syringe 86b includes a plunger or piston 90b that is movably disposed within the syringe barrel 88b. By movement of the plunger 90b along the axis 100b (FIG. 2A) through the operation of the power head 50, fluid is discharged from the syringe barrel 88b through the nozzle 89b of the syringe 86b. A suitable conduit (not shown) typically fluidly interconnects the nozzle 89b in any suitable manner and directs the fluid to a desired location (eg, a patient).

  The syringe 86a is interconnected to the power head 50 via the intermediate face plate 102a. The face plate 102a includes a cradle 104 that supports at least a portion of the syringe barrel 88a and may provide / accommodate any additional functionality or combination of functionality. The mounting tool 82a is disposed on and fixed to the power head 50 for interaction with the face plate 102a. The ram coupler 76 of the ram 74, which is each part of the syringe plunger drive assembly 56 of the syringe 86a, is disposed adjacent to the face plate 102a when mounted on the power head 50. Details regarding the syringe plunger drive assembly 56 are described in greater detail below in connection with FIG. 2C. In general, the ram coupler 76 may be coupled to the syringe plunger 90a of the syringe 86a, and then the ram coupler 76 and ram 74 are moved relative to the power head 50, and the syringe plunger along the axis 100a (FIG. 2A). 90a can be moved. When moving the syringe plunger 90a to release fluid from the nozzle 89a of the syringe 86a, the ram connector 76 engages the syringe plunger 90a but may not be actually connected to the syringe plunger 90a. .

  The face plate 104a is at least generally adapted to movement of the shafts 100a, 100b (syringe plungers 90a, 90b, respectively) for both mounting of the face plate 104a on the mounting tool 82a on the power head 50 and removal of the face plate 104a therefrom. And can move in a plane perpendicular to (shown in FIG. 2A). Faceplate 104 a can be used to connect syringe plunger 90 a to a corresponding ram connector 76 on powerhead 50. In this regard, the face plate 104a includes a pair of handles 106a. Generally, with the syringe 86a initially positioned within the faceplate 102a, the handle 106a is at least generally orthogonal to the axes 100a, 100b (related to the movement of the syringe plungers 90a, 90b, respectively, shown in FIG. 2A). Can be moved to translate / translate in the plane of movement. By moving the handle 106a to one position, the syringe 86a moves / translates at least generally downward (relative to the faceplate 102a) and the syringe plunger 90a connects to its corresponding ram connector 76. Moving the handle 106a to another position moves / translates the syringe 86a at least generally upward (relative to the faceplate 102a) and separates the syringe plunger 90a from its corresponding ram connector 76.

  The syringe 86b is interconnected to the power head 50 via the intermediate face plate 102b. The mounting tool 82b is disposed on and fixed to the power head 50 for interaction with the face plate 102b. The ram coupler 76 of the ram 74, which is each part of the syringe plunger drive assembly 56 of the syringe 86b, is disposed adjacent to the face plate 102b when mounted on the power head 50. Details regarding the syringe plunger drive assembly 56 will be discussed again below in connection with FIG. 2C. In general, the ram coupler 76 can be coupled to the syringe plunger 90b of the syringe 86b, and then the ram coupler 76 and ram 74 are moved relative to the power head 50 to cause the syringe plunger along the axis 100b (FIG. 2A). 90b can be moved. When moving the syringe plunger 90a to release fluid from the nozzle 89b of the syringe 86b, the ram connector 76 engages the syringe plunger 90b, but is not actually connected to the syringe plunger 90b.

  The face plate 104b is at least generally adapted to movement of the shafts 100a, 100b (syringe plungers 90a, 90b, respectively) for both mounting of the face plate 104b on the mounting tool 82b on the power head 50 and removal of the face plate 104b therefrom. And can move in a plane perpendicular to (shown in FIG. 2A). Faceplate 104b may be used to connect syringe plunger 90b to a corresponding ram connector 76 on power head 50. In this regard, the face plate 104b may include a handle 106b. In general, with the syringe 86b initially positioned within the faceplate 102b, the syringe 86b can rotate along its long axis 100b (FIG. 2A) and relative to the faceplate 102b. This rotation may be achieved by moving the handle 106a, grasping and turning the syringe 86b, or both. In any case, this rotation causes both syringe 86b and faceplate 102b to be at least generally orthogonal to axes 100a, 100b (respectively associated with the operation of syringe plungers 90a, 90b and shown in FIG. 2A). Move / translate in the plane. By rotating the syringe 86b in one direction, the syringe 86b and the faceplate 102b move / translate at least generally downward, and the syringe plunger 90b connects to its corresponding ram connector 76. By rotating the syringe 86b in the opposite direction, the syringe 86b and faceplate 102b move / translate at least generally upward, and the syringe plunger 90b separates from its corresponding ram connector 76.

  As shown in FIG. 2B, the syringe plunger 90 b includes a plunger body 92 and a syringe plunger connector 94. The syringe plunger connector 94 includes a shaft 98 extending from the plunger main body 92 and a head 96 spaced from the plunger main body 92. Each of the ram couplers 76 includes a larger slot disposed on the face of the ram coupler 76 behind the smaller slot. When the syringe plunger 90b and its corresponding ram connector 76 are in a connected state or situation, the head 96 of the syringe plunger connector 94 can be placed in the larger slot of the ram connector 76, and the syringe plunger connector The 94 shaft 98 may extend through a smaller slot on the face of the ram coupler 76. Syringe plunger 90 a may include a similar syringe plunger connector 94 for interaction with its corresponding ram connector 76.

  In the case of the power injector 40, the power head 50 is used to discharge fluid from the syringes 86a, 86b in the case of the power injector 40. That is, the power head 50 provides a driving force for discharging fluid from each of the syringes 86a and 86b. One embodiment relating to what may be characterized as a syringe plunger drive assembly is shown in FIG. 2C and identified by reference numeral 56 and utilized by the powerhead 50 to discharge fluid from each of the syringes 86a, 86b. obtain. A separate syringe plunger drive assembly 56 may be incorporated into the power head 50 of each of the syringes 86a, 86b. In this regard, and referring again to FIGS. 2A-2B, the powerhead 50 may include manual knobs 29a and 29b for use in controlling each of the syringe plunger drive assemblies 56 separately.

  Initially and in connection with the syringe plunger drive assembly 56 of FIG. 2C, each of its individual components may have any suitable size, shape, configuration, and / or type. The syringe plunger drive assembly 56 includes a motor 58 having an output shaft 60. A drive gear 62 is mounted on and rotates with the output shaft 60 of the motor 58. The drive gear 62 is engaged with, or at least engageable with, the drive gear 64. This drive gear 64 is mounted on a drive screw or shaft 66 and rotates therewith. The axis around which the drive screw 66 rotates is identified by reference numeral 68. One or more bearings 72 suitably support the drive screw 66.

  The carriage or ram 74 is movably mounted on the drive screw 66. Generally, rotation in one direction of drive screw 66 advances ram 74 axially along drive screw 66 (and thus along axis 68) in the direction of the corresponding syringe 86a / b, while drive screw 66 Rotation in the opposite direction advances the ram 74 axially along the drive screw 66 (and thus along the axis 68) away from the corresponding syringe 86a / b. In this regard, the outer periphery of at least a portion of the drive screw 66 includes a helical thread 70 that interacts with at least a portion of the ram 74. The ram 74 is also movably mounted in a suitable bushing 78 that does not allow the ram 74 to rotate during rotation of the drive screw 66. Thus, rotation of the drive screw 66 provides axial movement of the ram 74 in a direction defined by the direction of rotation of the drive screw 66.

  The ram 74 includes a connector 76 that can be removably connected to the syringe plunger connector 94 of the syringe plunger 90a / b of the corresponding syringe 86a / b. When the ram connector 76 and syringe connection plunger 94 are properly connected, the syringe plunger 90a / b moves with the ram 74. FIG. 2C shows a configuration in which the syringe 86a / b can be moved along its corresponding axis 100a / b without being coupled to the ram 74. FIG. The head 96 of the syringe plunger 90a / b is aligned with the ram connector 76, but the axis 68 of FIG. 2C remains in the offset configuration and the syringe 86a / b is moved along its corresponding axis 100a / b. If so, the syringe 86a / b may be translated in a plane perpendicular to the axis along which the ram 74 moves. This establishes a coupling engagement between the ram coupling 76 and the syringe plunger coupling 96 in the manner described above.

  Each of the power injectors 10, 40 of FIGS. 1 and 2A-2C may be used for any suitable application including, but not limited to, medical imaging applications that inject fluid into a specimen (eg, a patient). Typical medical imaging applications of the power injectors 10, 40 include computed tomography or CT imaging, magnetic resonance imaging or MRI, SPECT imaging, PET imaging, X-ray imaging, angiographic imaging, This includes but is not limited to optical imaging and ultrasound imaging. Each of the power injectors 10, 40 can be used alone or in combination with one or more other components. Each of the power injectors 10, 40, for example, communicates information (eg, scan delay information, injection start signal, injection rate) between the power injectors 10, 40 and one or more other components. And operably interconnected to one or more components.

  Each of the power injectors 10, 40, including but not limited to a single head configuration (for a single syringe) and a dual head configuration (for two syringes) may utilize any number of syringes. For multi-syringe configurations, each power injector 10, 40 may be released in any suitable manner and in any timing sequence (eg, release sequentially from two or more syringes, release simultaneously from two or more syringes, (Or any combination thereof) may release fluid from various syringes. Each such syringe utilized by each power injector 10, 40 may include any suitable fluid, such as a contrast agent, radiopharmaceutical, or saline. Each such syringe utilized by each of the power injectors 10, 40 may be installed in any suitable manner (eg, a rear loading configuration may be utilized and a front loading configuration may be utilized).

  One embodiment of a ram assembly is shown in FIGS. 3A-3B, identified by reference 110 and used in place of ram 20 by power injector 10 of FIG. 1 and of ram 74 by power injector 40 of FIG. 2A. Can be used instead. However, it should be understood that the ram assembly 110 can be utilized with any suitable power injector, in which case the power injector can be utilized for any suitable application. In the following, the ram assembly 110 will be described in connection with being incorporated into the power injector 10 of FIG.

  The ram assembly 110 includes a collar 112 that is threadably mounted on a drive screw 66 having a helical thread 70. Accordingly, the drive output 18 of the power injector 10 of FIG. 1 is in the form of a drive screw 66 from the syringe plunger drive assembly 56 described above in connection with FIG. 2C. Rotation of the drive screw 66 in one rotational direction may cause the collar 112 to travel in one axial direction along the drive screw 66 (ie, along the axis 68). Rotation of drive screw 66 in another rotational direction may cause collar 112 to travel in the opposite axial direction along drive screw 66 (ie, along axis 68).

  Another component of the ram assembly 110 includes an inner ram 120 that can be mounted on the collar 112 in any suitable manner (eg, by threaded engagement with at least a portion of the collar 112). Also, the inner ram 120 can be configured to include the collar 112 as an integral part thereof, or the inner ram 120 and the collar 112 can be made separately and secured to each other in any suitable manner. In any case, the opening 124 at least partially penetrates the sidewall 122 of the inner ram 120. In the illustrated embodiment, the side wall 122 is cylindrical, but other shapes may be suitable. A plurality of cam elements in the form of cams 128 are disposed at the end 126 of the inner ram 120. Each cam 128 may have any suitable size, shape, configuration, and / or type. A ram connector 158 utilized by the ram assembly 110 is provided, one cam 128 for each ram connector 158 described below. Any suitable number of ram couplers 158 may be utilized and correspondingly any suitable number of cams 128 may be utilized. A plurality of cams 128 may be disposed on the end 126 of the inner ram 120 in any suitable arrangement, and the inner ram 120 may include a ram connector 158 between a connected / separated position and a separated / separated position. Move.

  Inner ram 120 may extend at least partially within outer ram 140 of ram assembly 110. In general, the outer ram 140 and the inner ram 120 may move together along the drive screw 66, and the inner ram 120 may rotate relative to the outer ram 140. In the illustrated embodiment, the anti-rotation key 144 is attached to the sidewall 142 of the outer ram 140 in any suitable manner. The anti-rotation key 144 allows the outer ram 140 to move axially along with the drive screw 66 (with the inner ram 120) and the inner ram 120 is at least generally about the drive screw 66 relative to the outer ram 140. It can have any suitable size, shape, configuration, and / or type to be rotatable. For example, the anti-rotation key 144 interacts with an axially extending slot in the powerhead 12 (FIG. 1) so that the outer ram 140 rotates relative to or about the drive screw 66. do not do.

  Inner ram 120 may rotate about drive screw 66 to at least a certain degree to move various ram couplers 158 relative to outer ram 140. The rotation limiting slot 146 passes through the side wall 142 of the outer ram 140. A stop or pin 148 extends through the rotation limiting slot 146 and extends to the opening 124 on the side wall 122 of the inner ram 120. The pin 148 can be attached to or held on the sidewall 122 of the inner ram 120 in any suitable manner. Based on the foregoing description, the outer ram 140 may be constrained to be axially movable along with the drive screw 66 (along with the inner ram 120), while the inner ram 120 may be along the drive screw 66. It may be possible to move axially and rotate about the drive screw 66 over a range of rotation established by a rotation limiting slot 146 on the outer ram 140 and a pin 148 on the inner ram 120. Any suitable manner for providing the desired range of rotation to the inner ram 120 may be utilized by the ram assembly 110.

  Outer ram 140 includes an end 150. At least one ram connector 158 is movably / slidably interconnected to the outer ram end 150. Any suitable number of ram couplers 158 may be utilized by the ram assembly 110, including a single ram coupler 158 (not shown). In the illustrated embodiment, three ram connectors 158 are utilized, but in any case, the outer ram end 150 has a connector slot 152 for each ram connector 158 utilized by the ram assembly 110. Including. In the illustrated embodiment, each connector slot 152 includes a first slot section 154 and a second slot section 156.

  The ram connector 158 may be movably / slidably disposed within a connector slot 152 included on the outer ram end 150. Each ram connector 158 includes: 1) a connector section 160 disposed at least partially within the first slot section 154 of the corresponding connector slot 152 on the outer ram end 150; and 2) the end of the ram. And a base 162 disposed at least partially within the second slot section 156 of the corresponding connector slot 152 on the portion 150. In general, each ram coupler 158 has a relative movement between the inner ram 120 and the outer ram 140 between two common positions, i.e., between a coupled or coupled position and a separated or separated position ( In the illustrated embodiment, it may move within its corresponding connector slot 152 in response to relative rotational movement. In one embodiment, each ram connector 158 moves along an axial path relative to the outer ram 140.

  Referring now to FIG. 3B, the back side of the base 162 of each ram connector 158 (opposite its corresponding connector section 160) includes another cam element in the form of a cam slot 164. Each cam 128 on the inner ram end 126 is disposed within a cam slot 164 of a separate ram connector 158. Movement of the ram coupler 158 relative to the outer ram 140 within its respective coupler slot 152 is effected by or in response to rotation of the inner ram 120 relative to the outer ram 140. Due to the interaction between each cam 128 and its corresponding cam slot 164, in the illustrated embodiment, a ram coupler 158 within its respective coupler slot 152 in a direction determined by the direction of rotation of the drive screw 66. Move. Each of the cam elements included on the inner ram end 126 (cam 128 in the illustrated embodiment) as well as the cam elements included on the base 162 of the ram coupler 158 (in the illustrated embodiment, the cam slot 164) May have any suitable size, shape, configuration, and / or type. For example, the cam 128 may be incorporated into the base 162 of the ram connector 158 and the cam slot 164 may be incorporated into the inner ram end 126 (not shown). Further, each of the cams 128 may be in the form of a simple pin rather than the illustrated arcuate section.

  4A and 4B show two common positions of the ram coupler 158. FIG. The ram connector 158 is positioned in FIG. 4A to engage and pull the head 38 of the corresponding syringe plunger connector 34 while retracting the ram assembly 110 along the drive screw 66. This may be referred to as the connected or connected position of the ram connector 158. One feature of the coupled or coupled position is that the ram coupler 158 moves at least generally toward the axis 68 along which the ram assembly 100 moves (and the axis 68 about which the drive screw 66 can rotate). Can be mentioned. Another feature of the connected or connected location includes the ram connector 158 being positioned to at least partially align with the head 38 of the syringe plunger connector 34 of the corresponding syringe plunger 32. “Alignment” in this regard means an aspect that is collinear with or parallel to axis 68.

  The various ram connectors 158 are arranged in FIG. 4B so that the syringe plunger connector 34 is separable from the outer ram 140. This may be referred to as the separation or separation position of the ram coupler 158. One feature of the to-be-separated or separated position is that the ram connector 158 moves at least generally away from the axis 68 along which the ram assembly 100 moves (and the axis 68 about which the drive screw 66 can rotate). Can be mentioned. Another feature of the separation or separation position is that the ram coupler 158 is positioned so that it is not aligned with the head 38 of the syringe plunger coupler 34 of the corresponding syringe plunger 32. “Alignment” in this regard means an aspect that is collinear with or parallel to axis 68, as described above.

  The driving force for rotating the inner ram 120 relative to the outer ram 140 is the rotation of the drive screw 66, its helical thread 70 and the inner ram collar 112 (in the illustrated embodiment, the inner ram 120 is mounted thereon. ). The ram coupler 158 can be placed in the position of FIG. 4A when the ram assembly 110 is in a fully retracted position. Thereafter, the drive screw 66 is in a rotational direction associated with the discharge stroke of the ram assembly 110 (eg, a direction to advance the corresponding syringe plunger 32 in a direction that provides discharge from the corresponding syringe 28 (eg, FIG. 1)). Note that when rotating, the initial rotation of the drive screw 66 may not actually advance the ram assembly 110 along the drive screw 66 in the axial direction. This is because the inner ram 120 can rotate with the drive screw 66 until the pin 148 secured to the inner ram 120 engages the end of the rotation limiting slot 146 on the outer ram 140. It is desirable to consider this in software that can be used to control one or more aspects of the operation of the power injector 10 (FIG. 1). Rotation of the inner ram 120 in the manner described above causes the ram coupler 158 to move in response from the position of FIG. 4A to the position of FIG. 4B. Thus, in the event of a discharge stroke of the ram assembly 110, the corresponding syringe plunger 32 is advanced toward the discharge end 30a of its corresponding syringe 28 (FIG. 1) (eg, providing discharge from the corresponding syringe 28). As such, the end 120 of the inner ram engages (eg, butts against) the end of the head 38 of the corresponding syringe plunger connector 34. The syringe 28 can then be removed from the powerhead 12 (FIG. 1) at the end of the discharge stroke without requiring the ram assembly 110 to be retracted first.

  With the ram assembly 110 in its fully extended position, a new empty syringe 28 can be installed on the powerhead 12 (FIG. 1). Thereafter, the drive screw 66 rotates in a rotational direction associated with the retracting stroke of the ram assembly 110 (eg, a direction to advance the corresponding syringe plunger 32 at least generally away from its corresponding discharge end 30a of the syringe 28). Note that in some cases, initial rotation of the drive screw 66 may not actually advance the ram assembly 110 along the drive screw 66 in the axial direction. This is because the inner ram 120 can rotate with the drive screw 66 until the pin 148 secured to the inner ram 120 engages the opposite end of the rotation limiting slot 146 on the outer ram 140 as described above. Because. For example, if a retraction stroke is used to draw a desired volume of fluid into the syringe 28, this is considered in software that can be used to control one or more aspects of the operation of the power injector 10 (FIG. 1). It is desirable. Rotation of the inner ram 120 in the manner described above causes the ram coupler 158 to move in response to return from the position of FIG. 4B to the position of FIG. 4A. An axial retraction of the ram assembly 110 along the drive screw 66 during continuous rotation of the drive screw 66 causes the head 38 of the syringe plunger coupler 36 of the corresponding syringe plunger 34 to “pull” the ram coupler 158. .

  A variation of the ram assembly 110 of FIG. 3A is shown in FIG. Corresponding components between these two embodiments are identified by the same reference numerals, and unless otherwise specified, the description provided herein relates to each embodiment. These corresponding components that differ in at least some respects are identified by a “single dash” display in the embodiment of FIG. 5 and described in connection with any such differences. The various ram couplers utilized by the ram assembly 110 ′ of FIG. 5 are still generally operated at least partially in the same manner described above in connection with the embodiment of FIG. 3A. The inner ram 120 ′ includes one or more cams 128 that are each disposed within a cam slot 164 on the base 162 of the corresponding ram coupler 158, where each ram coupler 158 is an outer ram 140 ′. Is slidably disposed in a connector slot 152 formed on the outer ram end 150 ′ of the rim. Relative rotation between the inner ram 120 ′ and outer ram 140 ′ causes the ram coupler 158 to move along its respective coupler slot 152 due to interaction between its corresponding cam 128 and cam slot 164. To do.

  The ram assembly 110 'of FIG. 5 can be used in place of the ram 20 by the power injector 10 of FIG. However, it should be understood that the ram assembly 110 'can, of course, be utilized with any suitable power injector, in which case the power injector may be utilized for any suitable application. In the following, the ram assembly 110 'will be described in connection with being incorporated into the power injector 10 of FIG.

  One difference between the embodiment of FIGS. 3A and 5 is the components of the ram assembly that rotate to actuate one or more ram couplers 158. The outer ram 140 ′ in the case of the ram assembly 110 ′ of FIG. 5 rotates to move the various ram couplers 158 between the coupled / coupled position and the separated / separated position. On the other hand, the inner ram 120 in the case of the ram assembly 110 of FIG. 3A rotates to move the various ram couplers 158 between the coupled / coupled position and the separated / separated position. Various modifications are incorporated into the ram assembly 110 ′ of FIG. 5 to rotate the outer ram 140 ′ to activate the various ram couplers 158. The ram assembly 110 ′ of FIG. 5 is mounted on a collar 112 ′, which is then mounted on a drive screw 66 having a helical thread 70. Instead of mounting the anti-rotation key 114 on the outer ram 140 as in the embodiment of FIG. 3A, the ram assembly 110 ′ has an anti-rotation key 144 that is mounted or interconnected to the collar 112 ′. Since the inner ram 120 ′ is mounted on the collar 112 ′ in the manner described above, rotation of the drive screw 66 causes the inner ram 120 ′ to advance in the axial direction. However, the inner ram 120 ′ does not rotate with respect to the drive screw 66. That is, movement of the inner ram 120 ′ is primarily limited to axial movement along the drive screw 66 in the case of the ram assembly 110 ′ of FIG. 5. Any manner of holding the inner ram 120 ′ in the rotational stationary position may be utilized by the ram assembly 110 ′.

  Other modifications are incorporated into the ram assembly 110 ′ of FIG. 5 to rotate the outer ram 140 ′ to activate the various ram couplers 158. The side wall 142 'of the outer ram 140' includes one or more connecting elements 143 in a planar format and is used to rotate the outer ram 140 'in the manner detailed below. These connecting elements 143, in the illustrated embodiment, change the profile of the outer ram end 150 ′ (thus using a “single dash” display). The ram assembly 110 ′ may not need to incorporate a mechanism that limits the amount that the inner ram 120 ′ and the outer ram 140 ′ can rotate relative to each other based on the manner in which the outer ram 140 ′ can rotate. . In this regard, of the above-described structure associated with the ram assembly 110 of FIG. 3A, the opening 124 on the sidewall 122 'of the inner ram 120', the rotation limiting slot 146 on the sidewall 142 'of the outer ram 140', and the opening A pin 148 disposed in the portion 124 and moving within the rotation limiting slot 146 need not be included in the ram assembly 110 ′ of FIG.

  Another difference between the embodiment of FIGS. 3A and 5 is the position of the ram coupler 158 during the constant progression of the ram assembly 110 ′ along the drive screw 66. FIG. 6A shows the connected or connected position of the ram connector 158 utilized by the ram assembly 110 ′. The ram coupler 158 can be in the coupled / coupled position of FIG. 6A when the ram assembly 110 ′ is in its retracted position and when the syringe 28 is installed on the powerhead 12. By advancing the ram assembly 110 ′ along the rotating drive screw 66, 1) the connector section 160 of the ram connector 158 is brought into contact with the head 38 of the syringe plunger connector 34 of the corresponding syringe 28, 2) then The connector section 160 is deflected and placed on the side of the head 38 from which the shaft 36 extends relative to the corresponding syringe 28 (eg, the connector section 160 is associated with the head 38 of the associated syringe plunger connector 34). 3) The inner ram end 126 then engages the head 38 of the syringe plunger 32 (e.g., by striking it) and the syringe plunger 32 engages the discharge end 30a of the syringe 28. Go forward (Fig. 1). At the end of the discharge stroke of the ram assembly 110 ′, the ram coupler 158 may remain in the position of FIG. 6A to retract the syringe plunger 32 when retracting the ram assembly 110 ′ along the rotating drive screw 66. .

  Another difference between the embodiments of FIG. 3A and FIG. 5 is that one of the ram assemblies 110 ′ is adapted to move one or more ram couplings 158 between a coupled / coupled position and a separated / separated position. The method by which a part is rotated is mentioned. As described above, in the case of the embodiment of FIG. 3A, rotation of the drive screw 66 itself provides the driving force to rotate the inner ram 120 relative to the outer ram 140 and actuates the various ram couplers 158. As mentioned above, FIG. 6A shows the coupled / coupled position for the ram coupler 158 of the ram assembly 110 'of FIG. 6B shows the separated / separated position for the ram coupler 158 of the ram assembly 110 'of FIG. One manner of rotating the outer ram 140 ′ to move the ram coupler 158 between the positions of FIGS. 6A and 6B is shown in FIG. Other configurations may be suitable for rotation of the outer ram 140 ′.

  The power head 12 from the power injector 10 of FIG. 1 may include various features for incorporating the ram assembly 110 ′ shown in FIG. The powerhead 12 includes an end or surface 250 that protrudes toward the syringe 28 when installed on the powerhead 12. The plurality of guide pins 252 are disposed in any suitable arrangement on the end 250 of the powerhead, are secured thereto, and extend therefrom. Any suitable number of guide pins 252 may be utilized, and each guide pin 252 may have any suitable size, shape, and / or configuration. Each guide pin 252 includes a head 254 and a shaft 256 extending from its corresponding head 254 to the end 250 of the power head. Each head 254 is larger than its corresponding shaft 256 in at least one dimension. The ram assembly 110 'of FIG. 5 passes through the powerhead end 250 and is movable relative to the powerhead end 250 along the axis 68 (eg, FIG. 5).

  The housing 24 of the power injector 10 of FIG. 1 can be in the form of a faceplate 260, which is installed on the end 250 of the powerhead utilizing guide pins 252 and is shown in FIGS. Faceplate 260 includes opposing end surfaces 262 and 264. The end surface 264 protrudes toward the end 250 of the power head when the face plate 260 is installed on the power head 12. The end surface 262 is disposed on the opposite side and protrudes in the direction of the discharge end 30 a of the syringe 28 when the syringe 28 is installed on the power head 12 using the face plate 260.

  The end surface 264 of the face plate 260 includes a plurality of guide pin slots 268 that do not completely penetrate the face plate 268. There is one guide pin slot 268 on the faceplate 260 for each guide pin 252 on the end 250 of the powerhead. Each guide pin slot 268 includes a head section slot 270 and a shaft section slot 272. The head section slot 270 is sized to accommodate the head 254 of the corresponding guide pin 252 on the end 250 of the power head, and the head section slot 270 is the shaft section slot 272 in the views shown in FIGS. It extends upward at the rear of the. The shaft section slot 272 is sized to accommodate the shaft 256 of the corresponding guide pin 252 on the end 250 of the power head, but smaller than the head 254 of the corresponding guide pin 252 on the end 250 of the power head. . Accordingly, the head 254 of the corresponding guide pin 252 on the end 250 of the power head can be disposed within the portion of the head section slot 270 that extends below the shaft section slot 272. Thereafter, the faceplate 260 moves relative to the powerhead 12 in a plane perpendicular to the axis 68 (axis 68 along which the ram assembly 110 ′ can move) and its corresponding rear of the corresponding shaft section slot 272. Each head 254 may be disposed within a portion of the head section slot 270. Here, the movement of the face plate 260 relative to the power head 12 is restrained along the axis 68 (the axis 68 along which the ram assembly 110 ′ can move). Notwithstanding the foregoing, it should be understood that the faceplate 260 may be mounted on the powerhead end 250 in any suitable manner, including simply using one or more threaded fasteners.

  The opening 274 completely penetrates the faceplate 260 going from one end surface 262 to the opposite end surface 264. The opening 274 is sized such that the outer ram 140 ′ can travel through the faceplate 260 when the outer ram 140 ′ is directed toward the barrel 30 of the syringe 28 during the discharge stroke. The outer periphery of the opening 274 is defined by the inner wall 276. One or more locking slots or connecting element slots 278 are formed in the inner wall 276. Also, one or more connecting element sections or locking sections 280 are disposed around the opening 274. Locking slot 278 and locking section 280 are used to removably interconnect syringe 28 to face plate 260 in the manner detailed below.

  The cam plate 290 is movably disposed in a cam plate recess 282 formed on the end surface 264 of the face plate 260, and the end surface 264 places the face plate 260 on the power head 12 as described above. In some cases, it protrudes toward the end 250 of the power head. Opening 292 extends entirely through cam plate 290 to accommodate the connection of ram assembly 110 ′ with syringe plunger connector 34. The end portion of the opening 292 that protrudes toward the syringe 28 is larger than the end portion of the opening 292 that protrudes toward the end 250 of the power head. This allows the outer ram 140 ′ to travel through the cam plate 290 when the outer ram 140 ′ is directed toward the barrel 30 of the syringe 28 during the discharge stroke.

  One or more coupling elements in the form of slots 294 are included on the cam plate 290 for interacting with the corresponding coupling element or flange portion 31 on the flange 30b of the syringe 28. A plurality of connecting elements 298 may be formed in the cam plate 290 or integral with the cam plate 290 and may interact with corresponding connecting elements 143 on the outer periphery of the outer ram 140 ′. In the illustrated embodiment, the plurality of connecting elements 298 protrudes toward the end 250 of the powerhead and 1 on the outer periphery of the end portion of the opening 292 of the cam plate 290 into which the outer ram 140 ′ can extend. More than one surface type. The entire outer periphery of this end portion of the opening 292 of the cam plate 290 is at least generally coincident with and at least generally engaged with the entire outer periphery of the outer ram 140 '. Any suitable manner of securing the outer ram 140 ′ to the cam plate 290 may be utilized to allow the outer ram 140 ′ to rotate with the cam plate 290.

  The cam plate 290 can move relative to the power head 12 within the cam plate recess 282 of the face plate 260 in any suitable manner. A handle may be secured to the cam plate 290 to facilitate movement of the cam plate 290 within the cam plate recess 282 of the face plate 260, but this is not necessary in all cases (e.g., The cam plate 290 can be moved in the cam plate recess 282 of the face plate 260 using the syringe 28). When the cam plate coupling element 298 interacts with the outer ram coupling element 143, the cam plate 290 can be used to control the rotational position of the outer ram 140 ′. It should be understood that each of the cam plate coupling element 298 and the outer ram coupling element 143 may have any suitable size, shape, configuration, and / or type. Any suitable number of cam plate coupling elements 298 and outer ram coupling elements 143 may be utilized. Any scheme for coupling the cam plate 290 and / or the syringe 28 with the outer ram 140 'may be utilized to enable the cam plate 290 and / or the syringe 28 to be used to control the rotational position of the outer ram 140'.

  Next, installation of the syringe 28 on the power head 12 in FIG. 7 will be described. Face plate 260 is disposed on and supported by power head 12 in the manner described above. The syringe 28 can be advanced relative to the faceplate 260 with its connecting element 31 aligned with and passing through the locking slot 278 on the 260. The syringe 28 can be continuously advanced until each connecting element 31 is placed in its corresponding connecting element slot 294 on the cam plate 290. At this time, the head 38 of the syringe plunger 32 may be disposed in the outer ram 140 ′ by passing through a space collectively defined by the various ram connectors 158. Here, the syringe 28 can rotate relative to the power head 12. This relative rotational movement can be achieved in any suitable manner, including rotating the cam plate 290 through the handle 296 (which causes the syringe 28 to rotate at least about its major axis). The major axis may coincide with the axis 68 along which the ram assembly 110 'rotates and the drive screw 66 may rotate), to rotate / swivel the syringe 28 at least about its major axis (This causes the cam plate 290 to rotate within the cam plate recess 282 on the face plate 260), or both.

  The syringe 28 is locked to the face plate 260 by the relative movement between the cam plate 290 / syringe 28 and the face plate 260. Specifically, the connecting element 31 on the syringe flange 30b is moved to at least partially align with the locking section 280 of the faceplate 260. The outer ram 140 ′ also moves with the cam plate 290 and the syringe 28. This movement of the outer ram 140 ′ is a rotational movement about an axis 68 along which the ram assembly 110 ′ can move and the drive screw 66 can move along, at which point the inner ram remains in a rotational rest position. 120 '. The rotation of the outer ram 140 ′ moves the ram coupler 158 relative to the outer ram end 150. As previously described, the ram couplers 158 are carried by the outer ram 140 ', each having a cam slot 164 that interacts with a cam 128 on the inner ram 120'. Due to the relative rotational movement between the outer ram 140 ′ and the inner ram 120, the cam 128 will move its corresponding cam slot 164 to move the ram coupler 158 relative to the outer end 150 ′ of the ram. Move in.

  It should be understood that by reversing the above procedure, the syringe plunger connector 34 can be separated from the ram connector 158 of the outer ram 140 ′. It should also be understood that the cam plate 290 can be locked in any suitable manner at one or each of its two end positions, as desired / needed. The end position is where the various ram couplers 158 are located at the position of FIG. 6A, and the other end position of the cam plate 290 is where the various ram couplers 158 are located at the position of FIG. 6B. Position. Also, the cam plate 290 can be biased to at least one of its end positions in any suitable manner.

  The ram assembly of FIG. 3A uses rotation of the drive screw 66 to rotate the inner ram 120 relative to the rotating stationary outer ram 140 and then actuate various ram couplings 158 (eg, the end of the outer ram). The ram coupler 150 is moved relative to the portion 150). The ram assembly 110 ′ of FIG. 5 uses the rotation of the cam plate 290 and / or the syringe 28 to rotate the outer ram 140 ′ relative to the rotating stationary inner ram 120 ′. Each of these ram assemblies 110, 110 ′ may use any suitable mechanism for providing relative rotational movement between its respective inner and outer rams. Each of these ram assemblies 110, 110 'also uses two independently operable drive sources of the kind to provide relative rotational movement between its respective inner and outer rams. obtain. For example, each of the ram assemblies 110, 110 ′ can be configured to rotate their respective inner and outer rams relative to each other at any suitable time (eg, switch actuated) in the manner described herein. With its appropriate mechanism, its respective inner ram 120 and outer ram 140 ′ may be rotated. In each of the above embodiments, only one of the inner and outer rams is rotated to actuate the ram coupler 158, but each of the inner and outer rams provides the desired relative rotational motion. It should be understood that the rotation can be

  The foregoing description of the present invention has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit the invention to the form disclosed herein. As a result, variations and modifications corresponding to the above teachings and techniques and knowledge in the art are within the scope of the invention. Furthermore, the embodiments described above illustrate the best known modes of practicing the invention, and in such or other embodiments, the various required by the particular application or use of the invention. With the modification of, it is intended to enable the present invention to be used by those skilled in the art. It is intended that the appended claims be construed to include alternative embodiments to the extent permitted by the prior art.

Claims (44)

A ram assembly for a power injector,
A first ram section with an inner ram;
A second ram section comprising an outer ram movable relative to the first ram section;
Responsive to relative movement between the first ram section and the second ram section is movable relative to at least one of the first ram section and the second ram section. A ram coupler,
Movement of the ram coupler relative to the at least one of the first ram section and the second ram section is related to the coupling position and separation position of the ram coupling mechanism relative to the syringe plunger coupling of the syringe. Establish at least one of them,
The ram assembly is movable along a path to release fluid from the syringe.
A ram assembly comprising: a ram coupling. A ram assembly for a power injector,
A first ram section with an inner ram;
A second ram section comprising an outer ram, the outer ram being
Comprising an end of the outer ram that is movable relative to the inner ram and that defines the end of the ram assembly;
A second ram section;
A ram coupling slidably interconnected with an end of the outer ram and movable relative to the outer ram in response to relative movement between the inner ram and the outer ram; ,
Movement of the ram coupler with respect to the outer ram establishes at least one of a coupling position and a separating position of the ram coupling associated with a syringe plunger coupling;
The ram assembly is movable along a path to release fluid from the syringe.
A ram assembly comprising: a ram coupling.   The ram assembly according to any one of claims 1-2, wherein the second ram section is disposed around at least a portion of the first ram section.   The ram assembly according to any one of claims 1 to 3, wherein the first ram section and the second ram section are arranged concentrically.   The ram assembly according to any one of claims 1 to 4, wherein the first ram section, the second ram section, and the ram coupler are collectively movable along an axial path. .   The ram assembly according to any one of the preceding claims, wherein the first ram section and the second ram section are rotatable relative to each other.   The ram assembly according to any one of the preceding claims, wherein relative movement between the first ram section and the second ram section actuates the ram coupling.   The relative movement between the first ram section and the second ram section moves the ram coupler relative to each of the first ram section and the second ram section. The ram assembly according to any one of claims 7 to 7.   The relative movement between the first ram section and the second ram section is of the first type, and the movement of the ram coupler relative to the second ram section is the first type. The ram assembly according to any one of claims 1 to 8, which is a different second type. The first ram section comprises an inner ram;
The second ram section comprises an outer ram;
The inner ram is at least partially disposed within the outer ram;
The outer ram comprises an outer ram end defining an end of the ram assembly;
The ram coupler is slidably interconnected with an end of the outer ram;
A rotation lock engages the outer ram;
The inner ram is rotated to move the coupler relative to the end of the outer ram, while the outer ram is held at least generally in a rotational stationary position by the rotational lock.
A ram assembly according to any one of the preceding claims.   The ram assembly of claim 10, further comprising a rotational range limiter interconnecting with the inner ram. The outer ram comprises a slot;
A stop passes through the slot to the inner ram, the stop being held in a fixed position relative to the inner ram;
The stop moves along the slot during rotation of the inner ram;
The length of the slot defines the range over which the inner ram can rotate,
The ram assembly according to any one of claims 10-11. The first ram section comprises an inner ram;
The second ram section comprises an outer ram;
The inner ram is at least partially disposed within the outer ram;
The outer ram comprises an outer ram end defining an end of the ram assembly;
The ram coupler is slidably interconnected with an end of the outer ram;
A rotation lock is interconnected with the inner ram;
The outer ram is rotated to move the ram connector relative to the end of the outer ram, while the inner ram is held at least generally in a rotational stationary position by the rotational lock.
A ram assembly according to any one of the preceding claims.   The ram coupling is slidably interconnected to one of the first ram section and the second ram section, the ram coupling includes the first ram section and the second ram section. 14. A ram assembly according to any one of the preceding claims, wherein the ram assembly is movable along an axial path relative to the one of the ram sections. The first ram section comprises an inner ram;
The second ram section comprises an outer ram;
The inner ram is at least partially disposed within the outer ram;
The outer ram comprises an outer ram end defining an end of the ram assembly;
The end of the outer ram comprises a slot;
The ram coupler is slidably disposed within the slot;
15. A ram assembly according to any one of the preceding claims. One of the first ram section and the second ram section comprises a first cam member;
The ram coupler includes a second cam member that is engageable with the first cam member;
Relative movement between the first cam member and the second cam member actuates the ram coupling;
A ram assembly according to any one of the preceding claims. The first ram section comprises an inner ram;
The second ram section comprises an outer ram;
The inner ram is at least partially disposed within the inner ram;
The outer ram comprises an outer ram end defining an end of the ram assembly;
The ram coupler is slidably interconnected with an end of the outer ram;
The inner ram includes a first cam member;
The ram coupler comprises a second cam member that is engageable with the first cam member;
Relative movement between the first cam member and the second cam member actuates the ram coupler;
A ram assembly according to any one of the preceding claims.   18. A ram assembly according to any one of the preceding claims, wherein the ram connector is arranged such that the head of the syringe plunger connector is in a captured state during retraction of the ram assembly.   19. The ram connector according to any one of the preceding claims, wherein the ram connector is arranged such that the head of the syringe plunger connector is in a capture state during extension of the ram assembly for syringe discharge stalk. Ram assembly as described.   The ram coupler is arranged such that an end of the first ram section engages an end of the syringe plunger head during extension of the ram assembly for a syringe discharge stroke. Item 19. The ram assembly according to any one of items 1 to 18.   21. A ram assembly according to any one of the preceding claims, further comprising a plurality of the ram couplers.   The ram assembly of claim 21, wherein the plurality of ram couplings are collectively movable in response to relative movement between the first ram section and the second ram section.   23. The method of any one of claims 21 to 22, wherein each of the plurality of ram couplers is movable at least generally away from a common location and is also movable at least generally toward the common location. Ram assembly as described.   24. Each of the plurality of ram couplings is movable along a different axial path relative to at least one of the first ram section and the second ram section. The ram assembly according to claim 1. A power injector comprising the ram assembly according to any one of claims 1 to 24, a power head, and a syringe installed on the power head,
The power head includes a rotatable drive screw,
The ram assembly is mounted on the drive screw and is movable along the drive screw during rotation of the drive screw;
The first ram section comprises an inner ram;
The second ram section comprises an outer ram;
The outer ram comprises an end of the outer ram defining an end of the ram assembly;
The ram coupler is slidably interconnected with an end of the outer ram;
Power injector. The inner ram includes a first cam member;
The ram coupler includes a second cam member that is engageable with the first cam member;
Relative movement between the first cam member and the second cam member actuates the ram coupling;
26. A power injector according to claim 25. A method for changing the connection between a syringe plunger and a ram assembly of a power injector, the syringe comprising a syringe plunger and a syringe plunger coupling interconnecting the syringe plunger, the ram assembly comprising: A first ram section, a second ram section, and a ram coupler,
Rotating the first ram section relative to the second ram section;
Responsive to the rotating step, moving the ram coupler relative to at least one of the first ram section and the second ram section;
Changing the coupling state between the syringe plunger coupling and the ram coupling as a result of the step of moving the ram coupling.   24. The method of claim 23, wherein the ram assembly comprises a ram assembly according to any one of claims 1-26. The first ram section comprises an inner ram;
The second ram section comprises an outer ram;
The inner ram is at least partially disposed within the inner ram;
The outer ram comprises an outer ram end defining an end of the ram assembly;
The ram coupler is slidably interconnected with an end of the outer ram;
29. A method according to any one of claims 27 to 28.   30. The method of claim 29, wherein the rotating step includes rotating the inner ram.   31. The method of claim 30, further comprising limiting a range of rotation for the step of rotating the inner ram. Rotating the drive screw;
Advancing the ram assembly axially along the drive screw during the step of rotating the drive screw; and
The step of rotating the inner ram is performed in response to the step of rotating the drive screw;
32. A method according to any one of claims 30 to 31. Rotating the drive screw;
Advancing the ram assembly axially along the drive screw during the step of rotating the drive screw; and
The main force for the step of rotating the inner ram is generated during the screwed engagement between the drive screw and the ram assembly and the step of rotating the drive screw based on the screwed engagement. Including the power
32. A method according to any one of claims 30 to 31.   30. The method of claim 29, wherein the rotating step includes rotating the outer ram.   35. The method of claim 34, further comprising rotating the syringe, wherein rotating the outer ram is responsive to rotating the syringe.   Providing a connection between the syringe and the outer ram, and then rotating the syringe, wherein the rotating the outer ram is responsive to rotating the syringe. Item 35. The method according to Item 34.   37. The method of any one of claims 29 to 36, wherein moving the ram coupler comprises camming the ram coupler from the inner ram during at least a portion of the rotating step. the method of.   The ram coupling is slidably interconnected with the outer ram, and moving the ram coupling includes moving the ram coupling along an axial path relative to the outer ram. The method according to any one of claims 29 to 37.   39. A method according to any one of claims 27 to 38, wherein the ram assembly further comprises a plurality of the ram couplings.   Moving the plurality of ram connectors collectively to a connection position associated with the syringe plunger connector; and moving the plurality of ram connectors collectively to a separation position associated with the syringe plunger connector. 40. The method of claim 39, further comprising the step of:   The step of collectively moving the plurality of ram connectors to a connection position includes a step of moving the plurality of ram connectors toward at least a common position, and the plurality of ram connectors to a separation position. 41. The method of claim 40, wherein the step of collectively moving includes moving the plurality of ram couplers at least generally away from the common location. Changing the coupling state includes capturing the syringe plunger coupling of the syringe, the method comprising:
Retracting the ram assembly after the capturing step;
42. The method of any one of claims 27-41, further comprising retracting the syringe plunger of the syringe in response to retracting the ram assembly.   Extending the ram assembly after the capturing step, wherein the syringe plunger coupling remains captured during the extending step, and fluid is released from the syringe by the extending step. 43. The method of claim 42.   Extending the ram assembly after the capturing step, wherein fluid is released from the syringe by the extending step, and the step of changing the coupling state is for the extending step 43. The method of claim 42, comprising changing the ram connector from a connected state to a disconnected state with respect to the syringe plunger connector.

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